My favorite subject is (and has always been xD) Science.
I've always been curious as a child, asking my father questions as a little boy "How hot is the sun, why does the moon shine, why is the sky blue" etc. xD Every now and then in my free time I'll educate myself a bit on how things work xD
Least favorite, math. I didn't suck at it, but it never excites me, I just feel like I could drop dead (or asleep xD) anytime in that class xD